Rivers' rep confirming to E! News today that they got a call from Stewart's attorney regarding a crack in Rivers' latest book,Diary of a Mad Diva, that is a thinly veiled reference to K.Stew's 2012 affair with then-married Snow White and the Huntsman director Rupert Sanders.

So, what River wrote was: "Many stars only do one thing well. Of course, the best one-trick-pony is Kristen Stewart, who got a whole career by being able to juggle a director's balls."

The Joan Knows Best star's rep tells E! News, "There was a phone call made by Kristen's attorney to Joan's attorney regarding the content of the book. Considering the nature of the book, Diary of a Mad Diva, one needs only to read the prologue of the book to understand the context of the words that are written."

Added Rivers herself, giving a shout-out to one of her other frequent targets: "Kristen needs to calm down and have a thicker skin, and she should be glad she's not a Kardashian. Kristen is adorable and the fact that I mentioned her means she's an A-list celebrity."